That the blues vocalist Margaret Thornton recorded only one song in her life is, unfortunately, a fact that is off by only half; the correct number is two, but in terms of quality impact, it might as well have been dozens. Her recordings of the tunes "Texas Bound Blues" and "Jockey Blues," cut in 1927 for the short-lived Black Patti label, are among the dozens of recordings of early female-blues artists rescued from obscurity by archivist producers such as Document's Johnny Parth. As a result, her efforts have been assured a place in recording history, indeed inspiring one cri...